JPH01193483A - Solenoid valve - Google Patents

Abstract

PURPOSE:To prevent the occurrence of uncomfortable sounds by providing a fluid resistance portion in the vicinity of an electromagnetic valve. CONSTITUTION:A fluid resistance portion 23 for attenuating the water supply side pressure wave is provided in the vicinity of an electromagnetic valve 20 in the water supply side flow path 21 of the electromagnetic valve 20. Thus, contraflow from the electromagnetic valve 20 to the water supply side flow path 21 can be prevented as few as possible to reduce the attenuation of the water supply side return wave pressure and make always return wave pressure higher then the water discharge side pressure. Thus, a diaphragm can be prevented from vibration caused by negative pressure so that the occurrence of uncomfortable sounds can be surely prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a solenoid valve that can be effectively used as a solenoid valve for controlling fluid, such as a water stop valve or a hot/cold mixer faucet.

(B) Prior Art FIG. 3 is a sectional view of a conventional pilot type solenoid valve described in Japanese Patent Publication No. 49-4423.

A main valve hole 3 is formed in the valve box C between the inlet 1 and the outlet 2, and on the main valve seat 4 provided at the upper opening periphery of the main valve hole 3,
A diaphragm 5 with a retainer 6 for opening and closing the main valve hole 3 is arranged so as to be able to come into contact with or come into contact with and separate from the main valve hole 3.

A vertically elongated viroft valve hole 7 is formed in the center of the retainer 6, and a bleed hole 9 with a smaller diameter than the pilot valve hole 7 is formed between the diaphragm back chamber 8 provided at the back of the diaphragm 5 and the inlet 1. has been done. Pilot valve hole 7
On the top is a plunger 11 driven by a solenoid 10.
The pilot valve hole 7 is opened and closed by a valve body 12 attached to the lower end of the plunger 11.

In such a configuration, the solenoid 10 is de-energized,
The plunger 11 is pushed down by the coil spring 13,
When the valve body 12 comes into contact with the valve seat of the pilot valve hole 7 and closes the pilot valve hole 7, fluid flows into the diaphragm back chamber 8 through the path of the inlet 1 - the bleed hole 9 - the diaphragm back chamber 8, The inflowing fluid pressure causes the diaphragm 5 to close to the main valve seat 4.
, and the main valve hole 3 is closed.

In addition, in the closed state shown in the figure, the solenoid 10 is energized, and the plunger 11 moves against the coil spring 13 to move the iron core 1.
4, the valve body 12 separates from the valve seat of the pilot valve hole 7, and the pilot valve hole 7 opens. Then, the fluid in the diaphragm 5 passes through the pyroft valve hole 7 and flows out to the outlet 2 side.

At this time, since the diameter of the pilot valve hole 7 is larger than the diameter of the bleed hole 9, the amount of outflow is greater than the amount of inflow into the diaphragm back chamber 8, and the pressure in the diaphragm back chamber 8 is reduced. As a result, the diaphragm 5 is pushed up by the pressure of the fluid flowing in from the inlet 1, and the diaphragm 5 is separated from the main valve seat 4 to open the main valve hole 3.

(c) Problems to be Solved by the Invention However, in such a conventional solenoid valve, the inflow port 15 and the outflow boat 16 are simply connected to the water supply side flow path 17 and the water discharge side flow path 18. It is.

Therefore, in the valve opening/closing operation, as shown in FIG.
The return wave pressure on the (-next side) is between the pressure value on the water discharge side (secondary side), or a value lower than that (negative pressure). Such rapid pressure attenuation causes the diaphragm of the electromagnetic valve to vibrate, producing an impact sound, that is, an unpleasant sound when the valve is closed.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic valve that can prevent the vibrations described above as much as possible, perform a valve closing operation quietly, and prevent unpleasant noises from being generated.

(d) Means for solving the problem The present invention relates to a solenoid valve characterized in that a fluid resistance portion is provided in a water supply side flow path of the solenoid valve at a location close to the solenoid valve. It is.

(E) Actions and Effects With the above configuration, the present invention has the following actions and effects.

A fluid resistance section is provided in the water supply side flow path of the solenoid valve in a location close to the solenoid valve, so that backflow from the solenoid valve to the water supply side flow path is prevented as much as possible and return wave pressure on the water supply side is reduced. The return wave pressure can be kept higher than the water discharge side pressure at all times. Therefore, it is possible to effectively prevent the occurrence of vibration to the diaphragm caused by negative pressure, and the valve closing operation can be prevented. It is possible to do this quietly and reliably prevent unpleasant noises from occurring.

(f) Examples The present invention will now be explained in detail based on examples shown in the accompanying drawings.

In the conceptual diagram shown in FIG. 1, reference numeral 20 denotes a solenoid valve, and the solenoid valve 20 substantially has the configuration of the solenoid valve and the path explained in the above-mentioned prior art.

The inflow port and outflow port of the solenoid valve 20 are
The water supply side flow path 21 and the water discharge side flow path 22 are connected to each other, and the tip of the water discharge side flow path 22 is connected to a spout fitting or a shower fitting when used in a washroom or the like. become.

Further, with this configuration, water supply and water stop can be automatically performed by operating the solenoid valve 20.

The present embodiment is characterized in that, in the above configuration, a fluid resistance section 23 is provided in the water supply side flow path 21 of the solenoid valve 20 at a location close to the solenoid valve 20 to attenuate the water supply side pressure wave. have

In addition to the throttle valve shown in FIG. 1, the fluid resistance section 23 can also be formed by a pressure reducing valve, a pressure reducing bushing, or the like. In addition, the illustration shows a variable throttle valve that can change the flow rate adjustment, and thereby the fluid resistance can also be adjusted.

In such a configuration, the fluid resistance section 23 can reduce the pipe area of the water supply side flow path 21 at the same location,
When the water is stopped, a large fluid resistance can be applied to the backflow from the solenoid valve 20 to the water supply side channel 21.

Therefore, as shown in Fig. 2, the water supply side return wave pressure P1
By relaxing the attenuation curve, the return wave pressure P1 can be maintained higher than the water discharge side pressure P2 at all times. It is possible to effectively prevent the occurrence of vibration to the diaphragm that occurs when the temperature is high or the same level.
The solenoid valve can be closed silently, and unpleasant noise can be reliably prevented from occurring.

[Brief explanation of the drawing]

FIG. 1 is a conceptual configuration explanatory diagram showing the overall configuration of a solenoid valve according to the present invention, and FIG. 2 is a diagram showing changes over time in water supply side return wave pressure and water discharge side pressure in the same solenoid valve.
FIG. 3 is a conceptual configuration explanatory diagram showing the overall configuration of a conventional solenoid valve, and FIG. 4 is a diagram showing changes over time in return wave pressure on the water supply side and water discharge side pressure in the solenoid valve. In the figure, 10: Solenoid valve 21: Water supply side flow path 22: Water discharge side flow path 23: Fluid resistance section Patent applicant Totoki Co., Ltd.

Claims (1)

[Claims] 1. An electromagnetic valve characterized in that a fluid resistance section (23) is provided in a water supply side flow path (21) of the electromagnetic valve (20) in a location close to the electromagnetic valve (20).